1 files changed, 0 insertions, 297 deletions
diff --git a/src/pkg/crypto/rsa/pss.go b/src/pkg/crypto/rsa/pss.go
deleted file mode 100644
index e9f290825..000000000
--- a/src/pkg/crypto/rsa/pss.go
+++ /dev/null
@@ -1,297 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package rsa
-
-// This file implements the PSS signature scheme [1].
-//
-// [1] http://www.rsa.com/rsalabs/pkcs/files/h11300-wp-pkcs-1v2-2-rsa-cryptography-standard.pdf
-
-import (
-	"bytes"
-	"crypto"
-	"errors"
-	"hash"
-	"io"
-	"math/big"
-)
-
-func emsaPSSEncode(mHash []byte, emBits int, salt []byte, hash hash.Hash) ([]byte, error) {
-	// See [1], section 9.1.1
-	hLen := hash.Size()
-	sLen := len(salt)
-	emLen := (emBits + 7) / 8
-
-	// 1.  If the length of M is greater than the input limitation for the
-	//     hash function (2^61 - 1 octets for SHA-1), output "message too
-	//     long" and stop.
-	//
-	// 2.  Let mHash = Hash(M), an octet string of length hLen.
-
-	if len(mHash) != hLen {
-		return nil, errors.New("crypto/rsa: input must be hashed message")
-	}
-
-	// 3.  If emLen < hLen + sLen + 2, output "encoding error" and stop.
-
-	if emLen < hLen+sLen+2 {
-		return nil, errors.New("crypto/rsa: encoding error")
-	}
-
-	em := make([]byte, emLen)
-	db := em[:emLen-sLen-hLen-2+1+sLen]
-	h := em[emLen-sLen-hLen-2+1+sLen : emLen-1]
-
-	// 4.  Generate a random octet string salt of length sLen; if sLen = 0,
-	//     then salt is the empty string.
-	//
-	// 5.  Let
-	//       M' = (0x)00 00 00 00 00 00 00 00 || mHash || salt;
-	//
-	//     M' is an octet string of length 8 + hLen + sLen with eight
-	//     initial zero octets.
-	//
-	// 6.  Let H = Hash(M'), an octet string of length hLen.
-
-	var prefix [8]byte
-
-	hash.Write(prefix[:])
-	hash.Write(mHash)
-	hash.Write(salt)
-
-	h = hash.Sum(h[:0])
-	hash.Reset()
-
-	// 7.  Generate an octet string PS consisting of emLen - sLen - hLen - 2
-	//     zero octets.  The length of PS may be 0.
-	//
-	// 8.  Let DB = PS || 0x01 || salt; DB is an octet string of length
-	//     emLen - hLen - 1.
-
-	db[emLen-sLen-hLen-2] = 0x01
-	copy(db[emLen-sLen-hLen-1:], salt)
-
-	// 9.  Let dbMask = MGF(H, emLen - hLen - 1).
-	//
-	// 10. Let maskedDB = DB \xor dbMask.
-
-	mgf1XOR(db, hash, h)
-
-	// 11. Set the leftmost 8 * emLen - emBits bits of the leftmost octet in
-	//     maskedDB to zero.
-
-	db[0] &= (0xFF >> uint(8*emLen-emBits))
-
-	// 12. Let EM = maskedDB || H || 0xbc.
-	em[emLen-1] = 0xBC
-
-	// 13. Output EM.
-	return em, nil
-}
-
-func emsaPSSVerify(mHash, em []byte, emBits, sLen int, hash hash.Hash) error {
-	// 1.  If the length of M is greater than the input limitation for the
-	//     hash function (2^61 - 1 octets for SHA-1), output "inconsistent"
-	//     and stop.
-	//
-	// 2.  Let mHash = Hash(M), an octet string of length hLen.
-	hLen := hash.Size()
-	if hLen != len(mHash) {
-		return ErrVerification
-	}
-
-	// 3.  If emLen < hLen + sLen + 2, output "inconsistent" and stop.
-	emLen := (emBits + 7) / 8
-	if emLen < hLen+sLen+2 {
-		return ErrVerification
-	}
-
-	// 4.  If the rightmost octet of EM does not have hexadecimal value
-	//     0xbc, output "inconsistent" and stop.
-	if em[len(em)-1] != 0xBC {
-		return ErrVerification
-	}
-
-	// 5.  Let maskedDB be the leftmost emLen - hLen - 1 octets of EM, and
-	//     let H be the next hLen octets.
-	db := em[:emLen-hLen-1]
-	h := em[emLen-hLen-1 : len(em)-1]
-
-	// 6.  If the leftmost 8 * emLen - emBits bits of the leftmost octet in
-	//     maskedDB are not all equal to zero, output "inconsistent" and
-	//     stop.
-	if em[0]&(0xFF<<uint(8-(8*emLen-emBits))) != 0 {
-		return ErrVerification
-	}
-
-	// 7.  Let dbMask = MGF(H, emLen - hLen - 1).
-	//
-	// 8.  Let DB = maskedDB \xor dbMask.
-	mgf1XOR(db, hash, h)
-
-	// 9.  Set the leftmost 8 * emLen - emBits bits of the leftmost octet in DB
-	//     to zero.
-	db[0] &= (0xFF >> uint(8*emLen-emBits))
-
-	if sLen == PSSSaltLengthAuto {
-	FindSaltLength:
-		for sLen = emLen - (hLen + 2); sLen >= 0; sLen-- {
-			switch db[emLen-hLen-sLen-2] {
-			case 1:
-				break FindSaltLength
-			case 0:
-				continue
-			default:
-				return ErrVerification
-			}
-		}
-		if sLen < 0 {
-			return ErrVerification
-		}
-	} else {
-		// 10. If the emLen - hLen - sLen - 2 leftmost octets of DB are not zero
-		//     or if the octet at position emLen - hLen - sLen - 1 (the leftmost
-		//     position is "position 1") does not have hexadecimal value 0x01,
-		//     output "inconsistent" and stop.
-		for _, e := range db[:emLen-hLen-sLen-2] {
-			if e != 0x00 {
-				return ErrVerification
-			}
-		}
-		if db[emLen-hLen-sLen-2] != 0x01 {
-			return ErrVerification
-		}
-	}
-
-	// 11.  Let salt be the last sLen octets of DB.
-	salt := db[len(db)-sLen:]
-
-	// 12.  Let
-	//          M' = (0x)00 00 00 00 00 00 00 00 || mHash || salt ;
-	//     M' is an octet string of length 8 + hLen + sLen with eight
-	//     initial zero octets.
-	//
-	// 13. Let H' = Hash(M'), an octet string of length hLen.
-	var prefix [8]byte
-	hash.Write(prefix[:])
-	hash.Write(mHash)
-	hash.Write(salt)
-
-	h0 := hash.Sum(nil)
-
-	// 14. If H = H', output "consistent." Otherwise, output "inconsistent."
-	if !bytes.Equal(h0, h) {
-		return ErrVerification
-	}
-	return nil
-}
-
-// signPSSWithSalt calculates the signature of hashed using PSS [1] with specified salt.
-// Note that hashed must be the result of hashing the input message using the
-// given hash function. salt is a random sequence of bytes whose length will be
-// later used to verify the signature.
-func signPSSWithSalt(rand io.Reader, priv *PrivateKey, hash crypto.Hash, hashed, salt []byte) (s []byte, err error) {
-	nBits := priv.N.BitLen()
-	em, err := emsaPSSEncode(hashed, nBits-1, salt, hash.New())
-	if err != nil {
-		return
-	}
-	m := new(big.Int).SetBytes(em)
-	c, err := decrypt(rand, priv, m)
-	if err != nil {
-		return
-	}
-	s = make([]byte, (nBits+7)/8)
-	copyWithLeftPad(s, c.Bytes())
-	return
-}
-
-const (
-	// PSSSaltLengthAuto causes the salt in a PSS signature to be as large
-	// as possible when signing, and to be auto-detected when verifying.
-	PSSSaltLengthAuto = 0
-	// PSSSaltLengthEqualsHash causes the salt length to equal the length
-	// of the hash used in the signature.
-	PSSSaltLengthEqualsHash = -1
-)
-
-// PSSOptions contains options for creating and verifying PSS signatures.
-type PSSOptions struct {
-	// SaltLength controls the length of the salt used in the PSS
-	// signature. It can either be a number of bytes, or one of the special
-	// PSSSaltLength constants.
-	SaltLength int
-
-	// Hash, if not zero, overrides the hash function passed to SignPSS.
-	// This is the only way to specify the hash function when using the
-	// crypto.Signer interface.
-	Hash crypto.Hash
-}
-
-// HashFunc returns pssOpts.Hash so that PSSOptions implements
-// crypto.SignerOpts.
-func (pssOpts *PSSOptions) HashFunc() crypto.Hash {
-	return pssOpts.Hash
-}
-
-func (opts *PSSOptions) saltLength() int {
-	if opts == nil {
-		return PSSSaltLengthAuto
-	}
-	return opts.SaltLength
-}
-
-// SignPSS calculates the signature of hashed using RSASSA-PSS [1].
-// Note that hashed must be the result of hashing the input message using the
-// given hash function. The opts argument may be nil, in which case sensible
-// defaults are used.
-func SignPSS(rand io.Reader, priv *PrivateKey, hash crypto.Hash, hashed []byte, opts *PSSOptions) (s []byte, err error) {
-	saltLength := opts.saltLength()
-	switch saltLength {
-	case PSSSaltLengthAuto:
-		saltLength = (priv.N.BitLen()+7)/8 - 2 - hash.Size()
-	case PSSSaltLengthEqualsHash:
-		saltLength = hash.Size()
-	}
-
-	if opts.Hash != 0 {
-		hash = opts.Hash
-	}
-
-	salt := make([]byte, saltLength)
-	if _, err = io.ReadFull(rand, salt); err != nil {
-		return
-	}
-	return signPSSWithSalt(rand, priv, hash, hashed, salt)
-}
-
-// VerifyPSS verifies a PSS signature.
-// hashed is the result of hashing the input message using the given hash
-// function and sig is the signature. A valid signature is indicated by
-// returning a nil error. The opts argument may be nil, in which case sensible
-// defaults are used.
-func VerifyPSS(pub *PublicKey, hash crypto.Hash, hashed []byte, sig []byte, opts *PSSOptions) error {
-	return verifyPSS(pub, hash, hashed, sig, opts.saltLength())
-}
-
-// verifyPSS verifies a PSS signature with the given salt length.
-func verifyPSS(pub *PublicKey, hash crypto.Hash, hashed []byte, sig []byte, saltLen int) error {
-	nBits := pub.N.BitLen()
-	if len(sig) != (nBits+7)/8 {
-		return ErrVerification
-	}
-	s := new(big.Int).SetBytes(sig)
-	m := encrypt(new(big.Int), pub, s)
-	emBits := nBits - 1
-	emLen := (emBits + 7) / 8
-	if emLen < len(m.Bytes()) {
-		return ErrVerification
-	}
-	em := make([]byte, emLen)
-	copyWithLeftPad(em, m.Bytes())
-	if saltLen == PSSSaltLengthEqualsHash {
-		saltLen = hash.Size()
-	}
-	return emsaPSSVerify(hashed, em, emBits, saltLen, hash.New())
-}